羅德侯鯨:修订间差异
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小无编辑摘要 |
小无编辑摘要 |
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| color = pink |
| color = pink |
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| name = 羅德侯鯨 |
| name = 羅德侯鯨 |
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| fossil_range = [[新生代]] |
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| image = Rodhocetus.gif |
| image = Rodhocetus.gif |
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| image_width = 250px |
| image_width = 250px |
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| status = fossil |
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| regnum = [[動物界]] Animalia |
| regnum = [[動物界]] Animalia |
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| phylum = [[脊索動物門]] Chordata |
| phylum = [[脊索動物門]] Chordata |
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* ''R. balochistanensis'' |
* ''R. balochistanensis'' |
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'''羅德侯鯨'''([[學名]]''Rodhocetus'')是一[[屬]]已[[滅絕]]的[[鯨魚]],有著陸上[[哺乳動物]]的特徵,顯示了鯨魚從陸地進入[[海洋]]的過渡性 |
'''羅德侯鯨'''([[學名]]''Rodhocetus'')是一[[屬]]已[[滅絕]]的[[鯨魚]],有著陸上[[哺乳動物]]的特徵,顯示了鯨魚從陸地進入[[海洋]]的過渡性。 |
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第一個發現的[[物種]]是''R. kasrani'',牠的[[盆骨]]已與[[脊骨]]及後肢融合,並有分化的[[牙齒]]。另一個較近期發現的''R. balochistanensis'',牠的踝骨支持了羅德侯鯨是[[偶蹄目]][[演化]]的直接連結,並推翻了很多指鯨魚是由[[中獸目]]衍生而成的理論。羅德侯鯨踝骨結構中的滑車是雙軸式的,在哺乳動物中只有偶蹄目有這個特性。 |
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'''''Rodhocetus balochistanensis''''' is in fact believed to demonstrate a direct evolutionary link to [[Even-toed ungulate|artiodactyl]]s (modern examples of which are [[hippopotamus]]es and [[pig]]s). This has largely overturned previous fossil-based theories that whales were directly descended from [[mesonychid]]s, though it matches studies of the genetic relations between whales and other animals. |
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The claim is based on the structure of the ankle bones of this species, the [[trochlea]], which is double-spooled. This trait in only known in artiodactyls, as all other mammalian orders have a single-spooled trochlea. |
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[[Image:Rodhocetus.png|thumb|left|200px|羅德侯鯨的頭顱骨]] |
[[Image:Rodhocetus.png|thumb|left|200px|羅德侯鯨的頭顱骨]] |
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羅德侯鯨的[[耳骨]]已經非常像鯨魚的,但游泳方式則不同。羅德侯鯨肯定是半水中動物,後肢大而有蹼,用以在水中推進。牠的尾巴蛋壯,可以作為舵。很多學者指羅德侯鯨的游泳方式像水獺,但[[2003年]]進行的[[主成分分析]]發現羅德侯鯨的四肢比例與[[俄羅斯麝鼴]]接近。 |
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The ear bones of ''Rodhocetus'' are already very whale-like, though the swimming style is very different. ''Rodhocetus'' was definitely semi-aquatic, and had large, paddling hind feet to propel it through the water. It also had a strong tail which may have helped to act as a rudder. |
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羅德侯鯨的第一個化石是於[[2001年]]在[[巴基斯坦]]的[[俾路支省]]發現,估計屬於4700萬年前。牠提供了鯨魚演化歷史的資料。 |
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Many suggest that ''Rodhocetus'' may have swam like a modern otter, but through a [[principal components analysis]] done in 2003, Dr. Philip Gingerich demonstrated that its limb proportions were closer to that of the [[Russian desman]]. |
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==參考== |
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The first fossils of this species were found in [[Balochistan (Pakistan)|Balochistan]] Province, [[Pakistan]] in [[2001]] by [[Philip Gingerich]]. Dating from about 47 million years ago, they are one of a series of recent discoveries, including the [[pakicetid]]s, which have thrown considerable light on the previously mysterious evolutionary origin of whales. |
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{{reflist}} |
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==外部連結== |
==外部連結== |
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[[Category:鯨目]] |
[[Category:古鯨亞目]] |
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[[de:Rodhocetus]] |
[[de:Rodhocetus]] |
2008年1月11日 (五) 06:13的版本
羅德侯鯨 化石時期: 新生代 | ||||||||||||||
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羅德侯鯨(學名Rodhocetus)是一屬已滅絕的鯨魚,有著陸上哺乳動物的特徵,顯示了鯨魚從陸地進入海洋的過渡性。
第一個發現的物種是R. kasrani,牠的盆骨已與脊骨及後肢融合,並有分化的牙齒。另一個較近期發現的R. balochistanensis,牠的踝骨支持了羅德侯鯨是偶蹄目演化的直接連結,並推翻了很多指鯨魚是由中獸目衍生而成的理論。羅德侯鯨踝骨結構中的滑車是雙軸式的,在哺乳動物中只有偶蹄目有這個特性。
羅德侯鯨的耳骨已經非常像鯨魚的,但游泳方式則不同。羅德侯鯨肯定是半水中動物,後肢大而有蹼,用以在水中推進。牠的尾巴蛋壯,可以作為舵。很多學者指羅德侯鯨的游泳方式像水獺,但2003年進行的主成分分析發現羅德侯鯨的四肢比例與俄羅斯麝鼴接近。
羅德侯鯨的第一個化石是於2001年在巴基斯坦的俾路支省發現,估計屬於4700萬年前。牠提供了鯨魚演化歷史的資料。
參考
外部連結
http://www-personal.umich.edu/~gingeric/PDGwhales/Whales.htm